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许多药品的包装(或说明)上都标有“有效期”或“失效期”。据此可推算药品的使用有效期限。但这两种表示方法的含意和所指的时间概念均有区别,前者表示在规定的贮存条件下能保证药品质量的期限,指当月还有效,而后者意为该药品到此日期即超过安全有效范围,实指自该月1日已失效。如“有效期:1999.8”表示该药在1999年8月31日前有效。“失效期:1999.8”则表示该药1999年8月1日已失效,也就是
Many medicines are labeled “expiration date” or “expiration date” on the package (or description). Accordingly, the validity of the drug can be estimated. However, the meanings of the two methods of expression are different from the notion of the time they refer to. The former indicates that the time limit for ensuring the quality of the drug under the specified storage conditions means the effective month and the latter means that the drug has surpassed the safety limit by this date Effective range, real means since the 1st of January has lapsed. Such as “Validity: 1999.8” said the drug in August 31, 1999 effective. “Expiration date: 1999.8” indicates that the medicine expired on August 1, 1999, that is